Petryk Y. Bearing capacity and deformability of reinforced concrete bending elements prestressed on concrete

The dissertation research is devoted to the study of the regularities of the influence of reinforcement stress on concrete on the bearing capacity and the moment of occurrence of cracks in reinforced concrete bending elements. On the basis of the deformation method, a calculation method was developed taking into account the work of tensile concrete to determine the bearing capacity and the moment of cracking. The developed program and methodology for testing full-scale prestressed concrete reinforced concrete floor elements, which allow obtaining the necessary results for verifying the proposed calculation method. The tests of the floor slab were carried out in order to determine the bearing capacity and the moment of cracking. Refined existing prerequisites and assumptions DBN V.2.6-98: 2009 in terms of taking into account the work of tensioned concrete and developed the corresponding calculated dependencies, an algorithm and recommendations for determining the stress-strain state, bearing capacity and the moment of cracking of post stressed reinforced concrete elements of rectangular and T-sections. The bearing capacity of the beams is compared with the experimental results. It has been established that the bearing capacity calculated according to our recommendations based on the deformation method gives a significant economic effect (up to 30%) in comparison with similar structures without post-stress.